The hole, or stoma, where a colostomy bag is attached to the abdomen. Occasionally it can be used as a sexual orifice.

Sometimes referred to as 4th hole.
Person A: "I know Billy will have sex with anyone, but why does he mess with that ole nasty woman down on the corner?"

Person B: "She lets him use her side hole."
by SideEntrance August 21, 2011
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"Damn whiteney, what's that in your ass"
"Oh just my side hole, wanna lick it?"
by penguinita January 3, 2017
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